USB Type-C Dual-Role Port Protection Circuit
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Solution Overview
Problem
In computing systems with multiple USB Type-C dual-role power ports, there is a risk of high voltage appearing at one port due to firmware malfunctions or defects, potentially damaging low voltage external devices connected to other ports.
Innovation Solution
A protection device is implemented with switches that enable the high voltage path for one USB Type-C port while simultaneously disabling the high voltage path for other ports, using power switches and load switches to manage voltage paths and prevent reverse current flow, ensuring safe power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple USB Type-C dual-role power ports are implemented in a computing system, then power delivery versatility is improved, but the risk of high voltage damage to external devices increases
Solution Approach 1:
A protection device is introduced as an intermediary component between the power supply and multiple USB Type-C ports. This protection device includes switches that can isolate specific ports from high voltage, preventing direct damage to external devices while maintaining the overall versatility of the power delivery system.
Solution Approach 2:
The power delivery system is segmented into isolated ports through the protection device. Each USB Type-C port can be independently controlled and isolated from the power supply through switches, allowing high voltage to be delivered to one port while protecting other ports from potential damage.
2Power
If high voltage paths are enabled for multiple ports simultaneously, then power delivery capability is improved, but the risk of voltage leakage and reverse current damage increases
Solution Approach 1:
The protection device dynamically controls the state of switches based on the operational status of each port. When a port is in use and requires high voltage, the corresponding switch is activated to enable the high voltage path, while other switches remain inactive to prevent voltage leakage and reverse current to unused ports.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller monitors the status of each USB Type-C port and adjusts the switch states accordingly. This feedback ensures that high voltage paths are enabled only when necessary and that protection switches are activated to prevent voltage leakage and reverse current.
3Reliability
If protection switches are added to isolate high voltage paths, then safety against high voltage damage is improved, but device complexity increases
Solution Approach 1:
The protection device merges multiple functions into a single integrated component. The switches, controller, and isolation logic are combined in one device that can be placed between the power supply and the USB Type-C ports, providing comprehensive protection while minimizing the number of separate components needed.
Solution Approach 2:
The protection device is designed with universal functionality to handle multiple USB Type-C ports with different power requirements. The same protection device can isolate high voltage paths for various ports, manage reverse current protection, and provide safe power delivery to different external devices.
Data Source
AI summary
Techniques for protecting universal serial bus (USB) Type-C dual-role power ports in computing systems are described. In an example, a first USB Type-C dual-role power port of a computing system is enabled to sink current from a high voltage external device to a power supply of the computing system. The current is transferred through a high voltage path from the first USB Type-C dual-role power port to the power supply. Simultaneously, a high voltage path from the power supply to a second USB Type-C dual-role power port of the computing system is disabled.